Polyester polyol, urethane prepolymer and polyurethane

Abstract

A polyester polyol obtained by reacting a dicarboxylic acid component (A) with a diol component (B). The dicarboxylic acid component (A) contains a dicarboxylic acid (a1) represented by the following general formula (I) and a dicarboxylic acid (a2) represented by the following general formula (II). A content of the dicarboxylic acid (a2) is 0.02 to 3.00% by mass in 100% by mass of the total amount of the dicarboxylic acid component (A): R 1 , R 2 , R 4 , and R 5 each independently represent a divalent hydrocarbon group having 1 to 3 carbon atoms, and R 3 and R 6 each independently represent a monovalent hydrocarbon group having 1 to 3 carbon atoms.

1 . A polyester polyol obtained by reacting a dicarboxylic acid component (A) with a diol component (B),
 wherein the dicarboxylic acid component (A) comprises a dicarboxylic acid (a1) represented by the following general formula (I) and a dicarboxylic acid (a2) represented by the following general formula (II), and a content of the dicarboxylic acid (a2) is 0.02 to 3.00% by mass in 100% by mass of the total amount of the dicarboxylic acid component (A):   
       
         
           
           
               
               
           
         
         wherein R 1 , R 2 , R 4 , and R 5  each independently represent a divalent hydrocarbon group having 1 to 3 carbon atoms, and R 3  and R 6  each independently represent a monovalent hydrocarbon group having I to 3 carbon atoms. 
       
     
     
         2 . The polyester polyol according to  claim 1 , wherein a content of the dicarboxylic acid component (a2) is 3.00 parts by mass or less with respect to 100 parts by mass of the dicarboxylic acid component (a1). 
     
     
         3 . The polyester polyol according to  claim 1 , wherein R 1 , R 2 , R 4 , and R 5  in the general formulas (I) and (II) are each a methylene group. 
     
     
         4 . A urethane prepolymer obtained by reacting the polyester polyol according to  claim 1  with a polyisocyanate compound. 
     
     
         5 . A polyurethane made from the polyester polyol according to  claim 1 .